We're a CM and building an assembly using a potted transformer. One of our steps in the manufacturing process after aqueous washing is to put the assemblies in a dry heat oven at approximately 180 degrees F for 2 hours to ensure any water left over from washing is evaporated. This is the first time we have seen where a potted transformer has leaked the epoxy filling after being dried, and in some cases, has swollen the plastic housing that the transformer is encased in. We double checked the temp. Is this something anyone else has seen? Should we have a lower temperature??? Tom Parkinson - Quality System Manager WinTronics, Inc. --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------